| 2014-15 | QMJHL | Cape Breton Eagles | 54 | 10 | 35 | 45 | 58 | 4 | 7 | 2 | 3 | 5 | 6 | 1 |
| 2015-16 | QMJHL | Cape Breton Eagles | 62 | 42 | 57 | 99 | 112 | 40 | 12 | 7 | 5 | 12 | 14 | 3 |
| 2016-17 | QMJHL | Cape Breton Eagles | 20 | 6 | 12 | 18 | 33 | 4 | -- | -- | -- | -- | -- | -- |
| 2016-17 | QMJHL | Blainville-Boisbriand Armada | 28 | 15 | 22 | 37 | 45 | 13 | 19 | 9 | 13 | 22 | 26 | 1 |
| 2017-18 | NHL | Columbus Blue Jackets | 82 | 20 | 28 | 48 | 49 | 8 | 6 | 2 | 2 | 4 | 6 | 0 |
| 2018-19 | NHL | Columbus Blue Jackets | 82 | 27 | 34 | 61 | 64 | 16 | 10 | 2 | 3 | 5 | 14 | -5 |
| 2019-20 | NHL | Columbus Blue Jackets | 70 | 18 | 31 | 49 | 49 | -2 | 10 | 4 | 6 | 10 | 4 | 3 |
| 2020-21 | NHL | Columbus Blue Jackets | 5 | 1 | 0 | 1 | 2 | -2 | -- | -- | -- | -- | -- | -- |
| 2020-21 | NHL | Winnipeg Jets | 41 | 8 | 12 | 20 | 36 | -6 | 7 | 0 | 3 | 3 | 8 | -3 |
| 2021-22 | NHL | Winnipeg Jets | 81 | 28 | 32 | 60 | 106 | -6 | -- | -- | -- | -- | -- | -- |
| 2022-23 | NHL | Winnipeg Jets | 73 | 27 | 36 | 63 | 77 | 5 | 5 | 2 | 2 | 4 | 8 | -4 |
| 2023-24 | NHL | Los Angeles Kings | 82 | 16 | 24 | 40 | 70 | -9 | 5 | 1 | 0 | 1 | 20 | 0 |
| 2024-25 | NHL | Washington Capitals | 82 | 20 | 46 | 66 | 76 | 27 | 10 | 0 | 3 | 3 | 12 | 3 |
| 2025-26 | NHL | Washington Capitals | 16 | 4 | 3 | 7 | 4 | -4 | -- | -- | -- | -- | -- | -- |
| NHL TOTALS | 614 | 169 | 246 | 415 | 533 | 27 | 53 | 11 | 19 | 30 | 72 | -6 |